You will need to have the car scanned for the codes. The scanner must be able to scan for airbag controls. There are a lot of things that could cause this problem seat belts, sensors, control module, clock spring, etc. Some are cheaper then others. There is no way to give you a answer to this question without knowing more about the problem. Please be aware that messing with the controls and circuits on the airbags, can cause them to deploy doing serious body damage to you or even death.